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What and where were the undersea hot springs (submarine geothermal vents) that were discovered

and observed in 1977? What technology allowed scientists to make these observations and discoveries? What was the remarkable biological discovery at these (and later other) undersea hot springs? How does this deep-ocean marine ecosystem survive under such severe conditions? What type of plate boundary is located at these vent sites? What is the major submarine geologic feature formed along this plate boundary?

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